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Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge
[deliverable/linux.git] / drivers / net / wireless / ath / ath6kl / txrx.c
1 /*
2 * Copyright (c) 2004-2011 Atheros Communications Inc.
3 * Copyright (c) 2011-2012 Qualcomm Atheros, Inc.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include "core.h"
21 #include "debug.h"
22
23 /*
24 * tid - tid_mux0..tid_mux3
25 * aid - tid_mux4..tid_mux7
26 */
27 #define ATH6KL_TID_MASK 0xf
28 #define ATH6KL_AID_SHIFT 4
29
30 static inline u8 ath6kl_get_tid(u8 tid_mux)
31 {
32 return tid_mux & ATH6KL_TID_MASK;
33 }
34
35 static inline u8 ath6kl_get_aid(u8 tid_mux)
36 {
37 return tid_mux >> ATH6KL_AID_SHIFT;
38 }
39
40 static u8 ath6kl_ibss_map_epid(struct sk_buff *skb, struct net_device *dev,
41 u32 *map_no)
42 {
43 struct ath6kl *ar = ath6kl_priv(dev);
44 struct ethhdr *eth_hdr;
45 u32 i, ep_map = -1;
46 u8 *datap;
47
48 *map_no = 0;
49 datap = skb->data;
50 eth_hdr = (struct ethhdr *) (datap + sizeof(struct wmi_data_hdr));
51
52 if (is_multicast_ether_addr(eth_hdr->h_dest))
53 return ENDPOINT_2;
54
55 for (i = 0; i < ar->node_num; i++) {
56 if (memcmp(eth_hdr->h_dest, ar->node_map[i].mac_addr,
57 ETH_ALEN) == 0) {
58 *map_no = i + 1;
59 ar->node_map[i].tx_pend++;
60 return ar->node_map[i].ep_id;
61 }
62
63 if ((ep_map == -1) && !ar->node_map[i].tx_pend)
64 ep_map = i;
65 }
66
67 if (ep_map == -1) {
68 ep_map = ar->node_num;
69 ar->node_num++;
70 if (ar->node_num > MAX_NODE_NUM)
71 return ENDPOINT_UNUSED;
72 }
73
74 memcpy(ar->node_map[ep_map].mac_addr, eth_hdr->h_dest, ETH_ALEN);
75
76 for (i = ENDPOINT_2; i <= ENDPOINT_5; i++) {
77 if (!ar->tx_pending[i]) {
78 ar->node_map[ep_map].ep_id = i;
79 break;
80 }
81
82 /*
83 * No free endpoint is available, start redistribution on
84 * the inuse endpoints.
85 */
86 if (i == ENDPOINT_5) {
87 ar->node_map[ep_map].ep_id = ar->next_ep_id;
88 ar->next_ep_id++;
89 if (ar->next_ep_id > ENDPOINT_5)
90 ar->next_ep_id = ENDPOINT_2;
91 }
92 }
93
94 *map_no = ep_map + 1;
95 ar->node_map[ep_map].tx_pend++;
96
97 return ar->node_map[ep_map].ep_id;
98 }
99
100 static bool ath6kl_process_uapsdq(struct ath6kl_sta *conn,
101 struct ath6kl_vif *vif,
102 struct sk_buff *skb,
103 u32 *flags)
104 {
105 struct ath6kl *ar = vif->ar;
106 bool is_apsdq_empty = false;
107 struct ethhdr *datap = (struct ethhdr *) skb->data;
108 u8 up = 0, traffic_class, *ip_hdr;
109 u16 ether_type;
110 struct ath6kl_llc_snap_hdr *llc_hdr;
111
112 if (conn->sta_flags & STA_PS_APSD_TRIGGER) {
113 /*
114 * This tx is because of a uAPSD trigger, determine
115 * more and EOSP bit. Set EOSP if queue is empty
116 * or sufficient frames are delivered for this trigger.
117 */
118 spin_lock_bh(&conn->psq_lock);
119 if (!skb_queue_empty(&conn->apsdq))
120 *flags |= WMI_DATA_HDR_FLAGS_MORE;
121 else if (conn->sta_flags & STA_PS_APSD_EOSP)
122 *flags |= WMI_DATA_HDR_FLAGS_EOSP;
123 *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
124 spin_unlock_bh(&conn->psq_lock);
125 return false;
126 } else if (!conn->apsd_info)
127 return false;
128
129 if (test_bit(WMM_ENABLED, &vif->flags)) {
130 ether_type = be16_to_cpu(datap->h_proto);
131 if (is_ethertype(ether_type)) {
132 /* packet is in DIX format */
133 ip_hdr = (u8 *)(datap + 1);
134 } else {
135 /* packet is in 802.3 format */
136 llc_hdr = (struct ath6kl_llc_snap_hdr *)
137 (datap + 1);
138 ether_type = be16_to_cpu(llc_hdr->eth_type);
139 ip_hdr = (u8 *)(llc_hdr + 1);
140 }
141
142 if (ether_type == IP_ETHERTYPE)
143 up = ath6kl_wmi_determine_user_priority(
144 ip_hdr, 0);
145 }
146
147 traffic_class = ath6kl_wmi_get_traffic_class(up);
148
149 if ((conn->apsd_info & (1 << traffic_class)) == 0)
150 return false;
151
152 /* Queue the frames if the STA is sleeping */
153 spin_lock_bh(&conn->psq_lock);
154 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
155 skb_queue_tail(&conn->apsdq, skb);
156 spin_unlock_bh(&conn->psq_lock);
157
158 /*
159 * If this is the first pkt getting queued
160 * for this STA, update the PVB for this STA
161 */
162 if (is_apsdq_empty) {
163 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
164 vif->fw_vif_idx,
165 conn->aid, 1, 0);
166 }
167 *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
168
169 return true;
170 }
171
172 static bool ath6kl_process_psq(struct ath6kl_sta *conn,
173 struct ath6kl_vif *vif,
174 struct sk_buff *skb,
175 u32 *flags)
176 {
177 bool is_psq_empty = false;
178 struct ath6kl *ar = vif->ar;
179
180 if (conn->sta_flags & STA_PS_POLLED) {
181 spin_lock_bh(&conn->psq_lock);
182 if (!skb_queue_empty(&conn->psq))
183 *flags |= WMI_DATA_HDR_FLAGS_MORE;
184 spin_unlock_bh(&conn->psq_lock);
185 return false;
186 }
187
188 /* Queue the frames if the STA is sleeping */
189 spin_lock_bh(&conn->psq_lock);
190 is_psq_empty = skb_queue_empty(&conn->psq);
191 skb_queue_tail(&conn->psq, skb);
192 spin_unlock_bh(&conn->psq_lock);
193
194 /*
195 * If this is the first pkt getting queued
196 * for this STA, update the PVB for this
197 * STA.
198 */
199 if (is_psq_empty)
200 ath6kl_wmi_set_pvb_cmd(ar->wmi,
201 vif->fw_vif_idx,
202 conn->aid, 1);
203 return true;
204 }
205
206 static bool ath6kl_powersave_ap(struct ath6kl_vif *vif, struct sk_buff *skb,
207 u32 *flags)
208 {
209 struct ethhdr *datap = (struct ethhdr *) skb->data;
210 struct ath6kl_sta *conn = NULL;
211 bool ps_queued = false;
212 struct ath6kl *ar = vif->ar;
213
214 if (is_multicast_ether_addr(datap->h_dest)) {
215 u8 ctr = 0;
216 bool q_mcast = false;
217
218 for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) {
219 if (ar->sta_list[ctr].sta_flags & STA_PS_SLEEP) {
220 q_mcast = true;
221 break;
222 }
223 }
224
225 if (q_mcast) {
226 /*
227 * If this transmit is not because of a Dtim Expiry
228 * q it.
229 */
230 if (!test_bit(DTIM_EXPIRED, &vif->flags)) {
231 bool is_mcastq_empty = false;
232
233 spin_lock_bh(&ar->mcastpsq_lock);
234 is_mcastq_empty =
235 skb_queue_empty(&ar->mcastpsq);
236 skb_queue_tail(&ar->mcastpsq, skb);
237 spin_unlock_bh(&ar->mcastpsq_lock);
238
239 /*
240 * If this is the first Mcast pkt getting
241 * queued indicate to the target to set the
242 * BitmapControl LSB of the TIM IE.
243 */
244 if (is_mcastq_empty)
245 ath6kl_wmi_set_pvb_cmd(ar->wmi,
246 vif->fw_vif_idx,
247 MCAST_AID, 1);
248
249 ps_queued = true;
250 } else {
251 /*
252 * This transmit is because of Dtim expiry.
253 * Determine if MoreData bit has to be set.
254 */
255 spin_lock_bh(&ar->mcastpsq_lock);
256 if (!skb_queue_empty(&ar->mcastpsq))
257 *flags |= WMI_DATA_HDR_FLAGS_MORE;
258 spin_unlock_bh(&ar->mcastpsq_lock);
259 }
260 }
261 } else {
262 conn = ath6kl_find_sta(vif, datap->h_dest);
263 if (!conn) {
264 dev_kfree_skb(skb);
265
266 /* Inform the caller that the skb is consumed */
267 return true;
268 }
269
270 if (conn->sta_flags & STA_PS_SLEEP) {
271 ps_queued = ath6kl_process_uapsdq(conn,
272 vif, skb, flags);
273 if (!(*flags & WMI_DATA_HDR_FLAGS_UAPSD))
274 ps_queued = ath6kl_process_psq(conn,
275 vif, skb, flags);
276 }
277 }
278 return ps_queued;
279 }
280
281 /* Tx functions */
282
283 int ath6kl_control_tx(void *devt, struct sk_buff *skb,
284 enum htc_endpoint_id eid)
285 {
286 struct ath6kl *ar = devt;
287 int status = 0;
288 struct ath6kl_cookie *cookie = NULL;
289
290 if (WARN_ON_ONCE(ar->state == ATH6KL_STATE_WOW))
291 return -EACCES;
292
293 spin_lock_bh(&ar->lock);
294
295 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
296 "%s: skb=0x%p, len=0x%x eid =%d\n", __func__,
297 skb, skb->len, eid);
298
299 if (test_bit(WMI_CTRL_EP_FULL, &ar->flag) && (eid == ar->ctrl_ep)) {
300 /*
301 * Control endpoint is full, don't allocate resources, we
302 * are just going to drop this packet.
303 */
304 cookie = NULL;
305 ath6kl_err("wmi ctrl ep full, dropping pkt : 0x%p, len:%d\n",
306 skb, skb->len);
307 } else
308 cookie = ath6kl_alloc_cookie(ar);
309
310 if (cookie == NULL) {
311 spin_unlock_bh(&ar->lock);
312 status = -ENOMEM;
313 goto fail_ctrl_tx;
314 }
315
316 ar->tx_pending[eid]++;
317
318 if (eid != ar->ctrl_ep)
319 ar->total_tx_data_pend++;
320
321 spin_unlock_bh(&ar->lock);
322
323 cookie->skb = skb;
324 cookie->map_no = 0;
325 set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
326 eid, ATH6KL_CONTROL_PKT_TAG);
327
328 /*
329 * This interface is asynchronous, if there is an error, cleanup
330 * will happen in the TX completion callback.
331 */
332 ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
333
334 return 0;
335
336 fail_ctrl_tx:
337 dev_kfree_skb(skb);
338 return status;
339 }
340
341 int ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev)
342 {
343 struct ath6kl *ar = ath6kl_priv(dev);
344 struct ath6kl_cookie *cookie = NULL;
345 enum htc_endpoint_id eid = ENDPOINT_UNUSED;
346 struct ath6kl_vif *vif = netdev_priv(dev);
347 u32 map_no = 0;
348 u16 htc_tag = ATH6KL_DATA_PKT_TAG;
349 u8 ac = 99 ; /* initialize to unmapped ac */
350 bool chk_adhoc_ps_mapping = false;
351 int ret;
352 struct wmi_tx_meta_v2 meta_v2;
353 void *meta;
354 u8 csum_start = 0, csum_dest = 0, csum = skb->ip_summed;
355 u8 meta_ver = 0;
356 u32 flags = 0;
357
358 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
359 "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__,
360 skb, skb->data, skb->len);
361
362 /* If target is not associated */
363 if (!test_bit(CONNECTED, &vif->flags)) {
364 dev_kfree_skb(skb);
365 return 0;
366 }
367
368 if (WARN_ON_ONCE(ar->state != ATH6KL_STATE_ON)) {
369 dev_kfree_skb(skb);
370 return 0;
371 }
372
373 if (!test_bit(WMI_READY, &ar->flag))
374 goto fail_tx;
375
376 /* AP mode Power saving processing */
377 if (vif->nw_type == AP_NETWORK) {
378 if (ath6kl_powersave_ap(vif, skb, &flags))
379 return 0;
380 }
381
382 if (test_bit(WMI_ENABLED, &ar->flag)) {
383 if ((dev->features & NETIF_F_IP_CSUM) &&
384 (csum == CHECKSUM_PARTIAL)) {
385 csum_start = skb->csum_start -
386 (skb_network_header(skb) - skb->head) +
387 sizeof(struct ath6kl_llc_snap_hdr);
388 csum_dest = skb->csum_offset + csum_start;
389 }
390
391 if (skb_headroom(skb) < dev->needed_headroom) {
392 struct sk_buff *tmp_skb = skb;
393
394 skb = skb_realloc_headroom(skb, dev->needed_headroom);
395 kfree_skb(tmp_skb);
396 if (skb == NULL) {
397 vif->net_stats.tx_dropped++;
398 return 0;
399 }
400 }
401
402 if (ath6kl_wmi_dix_2_dot3(ar->wmi, skb)) {
403 ath6kl_err("ath6kl_wmi_dix_2_dot3 failed\n");
404 goto fail_tx;
405 }
406
407 if ((dev->features & NETIF_F_IP_CSUM) &&
408 (csum == CHECKSUM_PARTIAL)) {
409 meta_v2.csum_start = csum_start;
410 meta_v2.csum_dest = csum_dest;
411
412 /* instruct target to calculate checksum */
413 meta_v2.csum_flags = WMI_META_V2_FLAG_CSUM_OFFLOAD;
414 meta_ver = WMI_META_VERSION_2;
415 meta = &meta_v2;
416 } else {
417 meta_ver = 0;
418 meta = NULL;
419 }
420
421 ret = ath6kl_wmi_data_hdr_add(ar->wmi, skb,
422 DATA_MSGTYPE, flags, 0,
423 meta_ver,
424 meta, vif->fw_vif_idx);
425
426 if (ret) {
427 ath6kl_warn("failed to add wmi data header:%d\n"
428 , ret);
429 goto fail_tx;
430 }
431
432 if ((vif->nw_type == ADHOC_NETWORK) &&
433 ar->ibss_ps_enable && test_bit(CONNECTED, &vif->flags))
434 chk_adhoc_ps_mapping = true;
435 else {
436 /* get the stream mapping */
437 ret = ath6kl_wmi_implicit_create_pstream(ar->wmi,
438 vif->fw_vif_idx, skb,
439 0, test_bit(WMM_ENABLED, &vif->flags), &ac);
440 if (ret)
441 goto fail_tx;
442 }
443 } else
444 goto fail_tx;
445
446 spin_lock_bh(&ar->lock);
447
448 if (chk_adhoc_ps_mapping)
449 eid = ath6kl_ibss_map_epid(skb, dev, &map_no);
450 else
451 eid = ar->ac2ep_map[ac];
452
453 if (eid == 0 || eid == ENDPOINT_UNUSED) {
454 ath6kl_err("eid %d is not mapped!\n", eid);
455 spin_unlock_bh(&ar->lock);
456 goto fail_tx;
457 }
458
459 /* allocate resource for this packet */
460 cookie = ath6kl_alloc_cookie(ar);
461
462 if (!cookie) {
463 spin_unlock_bh(&ar->lock);
464 goto fail_tx;
465 }
466
467 /* update counts while the lock is held */
468 ar->tx_pending[eid]++;
469 ar->total_tx_data_pend++;
470
471 spin_unlock_bh(&ar->lock);
472
473 if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) &&
474 skb_cloned(skb)) {
475 /*
476 * We will touch (move the buffer data to align it. Since the
477 * skb buffer is cloned and not only the header is changed, we
478 * have to copy it to allow the changes. Since we are copying
479 * the data here, we may as well align it by reserving suitable
480 * headroom to avoid the memmove in ath6kl_htc_tx_buf_align().
481 */
482 struct sk_buff *nskb;
483
484 nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC);
485 if (nskb == NULL)
486 goto fail_tx;
487 kfree_skb(skb);
488 skb = nskb;
489 }
490
491 cookie->skb = skb;
492 cookie->map_no = map_no;
493 set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
494 eid, htc_tag);
495
496 ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
497 skb->data, skb->len);
498
499 /*
500 * HTC interface is asynchronous, if this fails, cleanup will
501 * happen in the ath6kl_tx_complete callback.
502 */
503 ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
504
505 return 0;
506
507 fail_tx:
508 dev_kfree_skb(skb);
509
510 vif->net_stats.tx_dropped++;
511 vif->net_stats.tx_aborted_errors++;
512
513 return 0;
514 }
515
516 /* indicate tx activity or inactivity on a WMI stream */
517 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
518 {
519 struct ath6kl *ar = devt;
520 enum htc_endpoint_id eid;
521 int i;
522
523 eid = ar->ac2ep_map[traffic_class];
524
525 if (!test_bit(WMI_ENABLED, &ar->flag))
526 goto notify_htc;
527
528 spin_lock_bh(&ar->lock);
529
530 ar->ac_stream_active[traffic_class] = active;
531
532 if (active) {
533 /*
534 * Keep track of the active stream with the highest
535 * priority.
536 */
537 if (ar->ac_stream_pri_map[traffic_class] >
538 ar->hiac_stream_active_pri)
539 /* set the new highest active priority */
540 ar->hiac_stream_active_pri =
541 ar->ac_stream_pri_map[traffic_class];
542
543 } else {
544 /*
545 * We may have to search for the next active stream
546 * that is the highest priority.
547 */
548 if (ar->hiac_stream_active_pri ==
549 ar->ac_stream_pri_map[traffic_class]) {
550 /*
551 * The highest priority stream just went inactive
552 * reset and search for the "next" highest "active"
553 * priority stream.
554 */
555 ar->hiac_stream_active_pri = 0;
556
557 for (i = 0; i < WMM_NUM_AC; i++) {
558 if (ar->ac_stream_active[i] &&
559 (ar->ac_stream_pri_map[i] >
560 ar->hiac_stream_active_pri))
561 /*
562 * Set the new highest active
563 * priority.
564 */
565 ar->hiac_stream_active_pri =
566 ar->ac_stream_pri_map[i];
567 }
568 }
569 }
570
571 spin_unlock_bh(&ar->lock);
572
573 notify_htc:
574 /* notify HTC, this may cause credit distribution changes */
575 ath6kl_htc_indicate_activity_change(ar->htc_target, eid, active);
576 }
577
578 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
579 struct htc_packet *packet)
580 {
581 struct ath6kl *ar = target->dev->ar;
582 struct ath6kl_vif *vif;
583 enum htc_endpoint_id endpoint = packet->endpoint;
584 enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
585
586 if (endpoint == ar->ctrl_ep) {
587 /*
588 * Under normal WMI if this is getting full, then something
589 * is running rampant the host should not be exhausting the
590 * WMI queue with too many commands the only exception to
591 * this is during testing using endpointping.
592 */
593 set_bit(WMI_CTRL_EP_FULL, &ar->flag);
594 ath6kl_err("wmi ctrl ep is full\n");
595 return action;
596 }
597
598 if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
599 return action;
600
601 /*
602 * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
603 * the highest active stream.
604 */
605 if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
606 ar->hiac_stream_active_pri &&
607 ar->cookie_count <=
608 target->endpoint[endpoint].tx_drop_packet_threshold)
609 /*
610 * Give preference to the highest priority stream by
611 * dropping the packets which overflowed.
612 */
613 action = HTC_SEND_FULL_DROP;
614
615 /* FIXME: Locking */
616 spin_lock_bh(&ar->list_lock);
617 list_for_each_entry(vif, &ar->vif_list, list) {
618 if (vif->nw_type == ADHOC_NETWORK ||
619 action != HTC_SEND_FULL_DROP) {
620 spin_unlock_bh(&ar->list_lock);
621
622 set_bit(NETQ_STOPPED, &vif->flags);
623 netif_stop_queue(vif->ndev);
624
625 return action;
626 }
627 }
628 spin_unlock_bh(&ar->list_lock);
629
630 return action;
631 }
632
633 /* TODO this needs to be looked at */
634 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
635 enum htc_endpoint_id eid, u32 map_no)
636 {
637 struct ath6kl *ar = vif->ar;
638 u32 i;
639
640 if (vif->nw_type != ADHOC_NETWORK)
641 return;
642
643 if (!ar->ibss_ps_enable)
644 return;
645
646 if (eid == ar->ctrl_ep)
647 return;
648
649 if (map_no == 0)
650 return;
651
652 map_no--;
653 ar->node_map[map_no].tx_pend--;
654
655 if (ar->node_map[map_no].tx_pend)
656 return;
657
658 if (map_no != (ar->node_num - 1))
659 return;
660
661 for (i = ar->node_num; i > 0; i--) {
662 if (ar->node_map[i - 1].tx_pend)
663 break;
664
665 memset(&ar->node_map[i - 1], 0,
666 sizeof(struct ath6kl_node_mapping));
667 ar->node_num--;
668 }
669 }
670
671 void ath6kl_tx_complete(void *context, struct list_head *packet_queue)
672 {
673 struct ath6kl *ar = context;
674 struct sk_buff_head skb_queue;
675 struct htc_packet *packet;
676 struct sk_buff *skb;
677 struct ath6kl_cookie *ath6kl_cookie;
678 u32 map_no = 0;
679 int status;
680 enum htc_endpoint_id eid;
681 bool wake_event = false;
682 bool flushing[ATH6KL_VIF_MAX] = {false};
683 u8 if_idx;
684 struct ath6kl_vif *vif;
685
686 skb_queue_head_init(&skb_queue);
687
688 /* lock the driver as we update internal state */
689 spin_lock_bh(&ar->lock);
690
691 /* reap completed packets */
692 while (!list_empty(packet_queue)) {
693
694 packet = list_first_entry(packet_queue, struct htc_packet,
695 list);
696 list_del(&packet->list);
697
698 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
699 if (!ath6kl_cookie)
700 goto fatal;
701
702 status = packet->status;
703 skb = ath6kl_cookie->skb;
704 eid = packet->endpoint;
705 map_no = ath6kl_cookie->map_no;
706
707 if (!skb || !skb->data)
708 goto fatal;
709
710 __skb_queue_tail(&skb_queue, skb);
711
712 if (!status && (packet->act_len != skb->len))
713 goto fatal;
714
715 ar->tx_pending[eid]--;
716
717 if (eid != ar->ctrl_ep)
718 ar->total_tx_data_pend--;
719
720 if (eid == ar->ctrl_ep) {
721 if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
722 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
723
724 if (ar->tx_pending[eid] == 0)
725 wake_event = true;
726 }
727
728 if (eid == ar->ctrl_ep) {
729 if_idx = wmi_cmd_hdr_get_if_idx(
730 (struct wmi_cmd_hdr *) packet->buf);
731 } else {
732 if_idx = wmi_data_hdr_get_if_idx(
733 (struct wmi_data_hdr *) packet->buf);
734 }
735
736 vif = ath6kl_get_vif_by_index(ar, if_idx);
737 if (!vif) {
738 ath6kl_free_cookie(ar, ath6kl_cookie);
739 continue;
740 }
741
742 if (status) {
743 if (status == -ECANCELED)
744 /* a packet was flushed */
745 flushing[if_idx] = true;
746
747 vif->net_stats.tx_errors++;
748
749 if (status != -ENOSPC && status != -ECANCELED)
750 ath6kl_warn("tx complete error: %d\n", status);
751
752 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
753 "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
754 __func__, skb, packet->buf, packet->act_len,
755 eid, "error!");
756 } else {
757 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
758 "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
759 __func__, skb, packet->buf, packet->act_len,
760 eid, "OK");
761
762 flushing[if_idx] = false;
763 vif->net_stats.tx_packets++;
764 vif->net_stats.tx_bytes += skb->len;
765 }
766
767 ath6kl_tx_clear_node_map(vif, eid, map_no);
768
769 ath6kl_free_cookie(ar, ath6kl_cookie);
770
771 if (test_bit(NETQ_STOPPED, &vif->flags))
772 clear_bit(NETQ_STOPPED, &vif->flags);
773 }
774
775 spin_unlock_bh(&ar->lock);
776
777 __skb_queue_purge(&skb_queue);
778
779 /* FIXME: Locking */
780 spin_lock_bh(&ar->list_lock);
781 list_for_each_entry(vif, &ar->vif_list, list) {
782 if (test_bit(CONNECTED, &vif->flags) &&
783 !flushing[vif->fw_vif_idx]) {
784 spin_unlock_bh(&ar->list_lock);
785 netif_wake_queue(vif->ndev);
786 spin_lock_bh(&ar->list_lock);
787 }
788 }
789 spin_unlock_bh(&ar->list_lock);
790
791 if (wake_event)
792 wake_up(&ar->event_wq);
793
794 return;
795
796 fatal:
797 WARN_ON(1);
798 spin_unlock_bh(&ar->lock);
799 return;
800 }
801
802 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
803 {
804 int i;
805
806 /* flush all the data (non-control) streams */
807 for (i = 0; i < WMM_NUM_AC; i++)
808 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
809 ATH6KL_DATA_PKT_TAG);
810 }
811
812 /* Rx functions */
813
814 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
815 struct sk_buff *skb)
816 {
817 if (!skb)
818 return;
819
820 skb->dev = dev;
821
822 if (!(skb->dev->flags & IFF_UP)) {
823 dev_kfree_skb(skb);
824 return;
825 }
826
827 skb->protocol = eth_type_trans(skb, skb->dev);
828
829 netif_rx_ni(skb);
830 }
831
832 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
833 {
834 struct sk_buff *skb;
835
836 while (num) {
837 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
838 if (!skb) {
839 ath6kl_err("netbuf allocation failed\n");
840 return;
841 }
842 skb_queue_tail(q, skb);
843 num--;
844 }
845 }
846
847 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
848 {
849 struct sk_buff *skb = NULL;
850
851 if (skb_queue_len(&p_aggr->rx_amsdu_freeq) <
852 (AGGR_NUM_OF_FREE_NETBUFS >> 2))
853 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq,
854 AGGR_NUM_OF_FREE_NETBUFS);
855
856 skb = skb_dequeue(&p_aggr->rx_amsdu_freeq);
857
858 return skb;
859 }
860
861 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
862 {
863 struct ath6kl *ar = target->dev->ar;
864 struct sk_buff *skb;
865 int rx_buf;
866 int n_buf_refill;
867 struct htc_packet *packet;
868 struct list_head queue;
869
870 n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
871 ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
872
873 if (n_buf_refill <= 0)
874 return;
875
876 INIT_LIST_HEAD(&queue);
877
878 ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
879 "%s: providing htc with %d buffers at eid=%d\n",
880 __func__, n_buf_refill, endpoint);
881
882 for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
883 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
884 if (!skb)
885 break;
886
887 packet = (struct htc_packet *) skb->head;
888 if (!IS_ALIGNED((unsigned long) skb->data, 4))
889 skb->data = PTR_ALIGN(skb->data - 4, 4);
890 set_htc_rxpkt_info(packet, skb, skb->data,
891 ATH6KL_BUFFER_SIZE, endpoint);
892 list_add_tail(&packet->list, &queue);
893 }
894
895 if (!list_empty(&queue))
896 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
897 }
898
899 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
900 {
901 struct htc_packet *packet;
902 struct sk_buff *skb;
903
904 while (count) {
905 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
906 if (!skb)
907 return;
908
909 packet = (struct htc_packet *) skb->head;
910 if (!IS_ALIGNED((unsigned long) skb->data, 4))
911 skb->data = PTR_ALIGN(skb->data - 4, 4);
912 set_htc_rxpkt_info(packet, skb, skb->data,
913 ATH6KL_AMSDU_BUFFER_SIZE, 0);
914 spin_lock_bh(&ar->lock);
915 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
916 spin_unlock_bh(&ar->lock);
917 count--;
918 }
919 }
920
921 /*
922 * Callback to allocate a receive buffer for a pending packet. We use a
923 * pre-allocated list of buffers of maximum AMSDU size (4K).
924 */
925 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
926 enum htc_endpoint_id endpoint,
927 int len)
928 {
929 struct ath6kl *ar = target->dev->ar;
930 struct htc_packet *packet = NULL;
931 struct list_head *pkt_pos;
932 int refill_cnt = 0, depth = 0;
933
934 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
935 __func__, endpoint, len);
936
937 if ((len <= ATH6KL_BUFFER_SIZE) ||
938 (len > ATH6KL_AMSDU_BUFFER_SIZE))
939 return NULL;
940
941 spin_lock_bh(&ar->lock);
942
943 if (list_empty(&ar->amsdu_rx_buffer_queue)) {
944 spin_unlock_bh(&ar->lock);
945 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
946 goto refill_buf;
947 }
948
949 packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
950 struct htc_packet, list);
951 list_del(&packet->list);
952 list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
953 depth++;
954
955 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
956 spin_unlock_bh(&ar->lock);
957
958 /* set actual endpoint ID */
959 packet->endpoint = endpoint;
960
961 refill_buf:
962 if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
963 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
964
965 return packet;
966 }
967
968 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
969 struct rxtid *rxtid, struct sk_buff *skb)
970 {
971 struct sk_buff *new_skb;
972 struct ethhdr *hdr;
973 u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
974 u8 *framep;
975
976 mac_hdr_len = sizeof(struct ethhdr);
977 framep = skb->data + mac_hdr_len;
978 amsdu_len = skb->len - mac_hdr_len;
979
980 while (amsdu_len > mac_hdr_len) {
981 hdr = (struct ethhdr *) framep;
982 payload_8023_len = ntohs(hdr->h_proto);
983
984 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
985 payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
986 ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
987 payload_8023_len);
988 break;
989 }
990
991 frame_8023_len = payload_8023_len + mac_hdr_len;
992 new_skb = aggr_get_free_skb(p_aggr);
993 if (!new_skb) {
994 ath6kl_err("no buffer available\n");
995 break;
996 }
997
998 memcpy(new_skb->data, framep, frame_8023_len);
999 skb_put(new_skb, frame_8023_len);
1000 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
1001 ath6kl_err("dot3_2_dix error\n");
1002 dev_kfree_skb(new_skb);
1003 break;
1004 }
1005
1006 skb_queue_tail(&rxtid->q, new_skb);
1007
1008 /* Is this the last subframe within this aggregate ? */
1009 if ((amsdu_len - frame_8023_len) == 0)
1010 break;
1011
1012 /* Add the length of A-MSDU subframe padding bytes -
1013 * Round to nearest word.
1014 */
1015 frame_8023_len = ALIGN(frame_8023_len, 4);
1016
1017 framep += frame_8023_len;
1018 amsdu_len -= frame_8023_len;
1019 }
1020
1021 dev_kfree_skb(skb);
1022 }
1023
1024 static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid,
1025 u16 seq_no, u8 order)
1026 {
1027 struct sk_buff *skb;
1028 struct rxtid *rxtid;
1029 struct skb_hold_q *node;
1030 u16 idx, idx_end, seq_end;
1031 struct rxtid_stats *stats;
1032
1033 rxtid = &agg_conn->rx_tid[tid];
1034 stats = &agg_conn->stat[tid];
1035
1036 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1037
1038 /*
1039 * idx_end is typically the last possible frame in the window,
1040 * but changes to 'the' seq_no, when BAR comes. If seq_no
1041 * is non-zero, we will go up to that and stop.
1042 * Note: last seq no in current window will occupy the same
1043 * index position as index that is just previous to start.
1044 * An imp point : if win_sz is 7, for seq_no space of 4095,
1045 * then, there would be holes when sequence wrap around occurs.
1046 * Target should judiciously choose the win_sz, based on
1047 * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
1048 * 2, 4, 8, 16 win_sz works fine).
1049 * We must deque from "idx" to "idx_end", including both.
1050 */
1051 seq_end = seq_no ? seq_no : rxtid->seq_next;
1052 idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
1053
1054 spin_lock_bh(&rxtid->lock);
1055
1056 do {
1057 node = &rxtid->hold_q[idx];
1058 if ((order == 1) && (!node->skb))
1059 break;
1060
1061 if (node->skb) {
1062 if (node->is_amsdu)
1063 aggr_slice_amsdu(agg_conn->aggr_info, rxtid,
1064 node->skb);
1065 else
1066 skb_queue_tail(&rxtid->q, node->skb);
1067 node->skb = NULL;
1068 } else
1069 stats->num_hole++;
1070
1071 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1072 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1073 } while (idx != idx_end);
1074
1075 spin_unlock_bh(&rxtid->lock);
1076
1077 stats->num_delivered += skb_queue_len(&rxtid->q);
1078
1079 while ((skb = skb_dequeue(&rxtid->q)))
1080 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1081 }
1082
1083 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1084 u16 seq_no,
1085 bool is_amsdu, struct sk_buff *frame)
1086 {
1087 struct rxtid *rxtid;
1088 struct rxtid_stats *stats;
1089 struct sk_buff *skb;
1090 struct skb_hold_q *node;
1091 u16 idx, st, cur, end;
1092 bool is_queued = false;
1093 u16 extended_end;
1094
1095 rxtid = &agg_conn->rx_tid[tid];
1096 stats = &agg_conn->stat[tid];
1097
1098 stats->num_into_aggr++;
1099
1100 if (!rxtid->aggr) {
1101 if (is_amsdu) {
1102 aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1103 is_queued = true;
1104 stats->num_amsdu++;
1105 while ((skb = skb_dequeue(&rxtid->q)))
1106 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1107 skb);
1108 }
1109 return is_queued;
1110 }
1111
1112 /* Check the incoming sequence no, if it's in the window */
1113 st = rxtid->seq_next;
1114 cur = seq_no;
1115 end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1116
1117 if (((st < end) && (cur < st || cur > end)) ||
1118 ((st > end) && (cur > end) && (cur < st))) {
1119 extended_end = (end + rxtid->hold_q_sz - 1) &
1120 ATH6KL_MAX_SEQ_NO;
1121
1122 if (((end < extended_end) &&
1123 (cur < end || cur > extended_end)) ||
1124 ((end > extended_end) && (cur > extended_end) &&
1125 (cur < end))) {
1126 aggr_deque_frms(agg_conn, tid, 0, 0);
1127 if (cur >= rxtid->hold_q_sz - 1)
1128 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1129 else
1130 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1131 (rxtid->hold_q_sz - 2 - cur);
1132 } else {
1133 /*
1134 * Dequeue only those frames that are outside the
1135 * new shifted window.
1136 */
1137 if (cur >= rxtid->hold_q_sz - 1)
1138 st = cur - (rxtid->hold_q_sz - 1);
1139 else
1140 st = ATH6KL_MAX_SEQ_NO -
1141 (rxtid->hold_q_sz - 2 - cur);
1142
1143 aggr_deque_frms(agg_conn, tid, st, 0);
1144 }
1145
1146 stats->num_oow++;
1147 }
1148
1149 idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1150
1151 node = &rxtid->hold_q[idx];
1152
1153 spin_lock_bh(&rxtid->lock);
1154
1155 /*
1156 * Is the cur frame duplicate or something beyond our window(hold_q
1157 * -> which is 2x, already)?
1158 *
1159 * 1. Duplicate is easy - drop incoming frame.
1160 * 2. Not falling in current sliding window.
1161 * 2a. is the frame_seq_no preceding current tid_seq_no?
1162 * -> drop the frame. perhaps sender did not get our ACK.
1163 * this is taken care of above.
1164 * 2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1165 * -> Taken care of it above, by moving window forward.
1166 */
1167 dev_kfree_skb(node->skb);
1168 stats->num_dups++;
1169
1170 node->skb = frame;
1171 is_queued = true;
1172 node->is_amsdu = is_amsdu;
1173 node->seq_no = seq_no;
1174
1175 if (node->is_amsdu)
1176 stats->num_amsdu++;
1177 else
1178 stats->num_mpdu++;
1179
1180 spin_unlock_bh(&rxtid->lock);
1181
1182 aggr_deque_frms(agg_conn, tid, 0, 1);
1183
1184 if (agg_conn->timer_scheduled)
1185 rxtid->progress = true;
1186 else
1187 for (idx = 0 ; idx < rxtid->hold_q_sz; idx++) {
1188 if (rxtid->hold_q[idx].skb) {
1189 /*
1190 * There is a frame in the queue and no
1191 * timer so start a timer to ensure that
1192 * the frame doesn't remain stuck
1193 * forever.
1194 */
1195 agg_conn->timer_scheduled = true;
1196 mod_timer(&agg_conn->timer,
1197 (jiffies +
1198 HZ * (AGGR_RX_TIMEOUT) / 1000));
1199 rxtid->progress = false;
1200 rxtid->timer_mon = true;
1201 break;
1202 }
1203 }
1204
1205 return is_queued;
1206 }
1207
1208 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1209 struct ath6kl_sta *conn)
1210 {
1211 struct ath6kl *ar = vif->ar;
1212 bool is_apsdq_empty, is_apsdq_empty_at_start;
1213 u32 num_frames_to_deliver, flags;
1214 struct sk_buff *skb = NULL;
1215
1216 /*
1217 * If the APSD q for this STA is not empty, dequeue and
1218 * send a pkt from the head of the q. Also update the
1219 * More data bit in the WMI_DATA_HDR if there are
1220 * more pkts for this STA in the APSD q.
1221 * If there are no more pkts for this STA,
1222 * update the APSD bitmap for this STA.
1223 */
1224
1225 num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1226 ATH6KL_APSD_FRAME_MASK;
1227 /*
1228 * Number of frames to send in a service period is
1229 * indicated by the station
1230 * in the QOS_INFO of the association request
1231 * If it is zero, send all frames
1232 */
1233 if (!num_frames_to_deliver)
1234 num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1235
1236 spin_lock_bh(&conn->psq_lock);
1237 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1238 spin_unlock_bh(&conn->psq_lock);
1239 is_apsdq_empty_at_start = is_apsdq_empty;
1240
1241 while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1242
1243 spin_lock_bh(&conn->psq_lock);
1244 skb = skb_dequeue(&conn->apsdq);
1245 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1246 spin_unlock_bh(&conn->psq_lock);
1247
1248 /*
1249 * Set the STA flag to Trigger delivery,
1250 * so that the frame will go out
1251 */
1252 conn->sta_flags |= STA_PS_APSD_TRIGGER;
1253 num_frames_to_deliver--;
1254
1255 /* Last frame in the service period, set EOSP or queue empty */
1256 if ((is_apsdq_empty) || (!num_frames_to_deliver))
1257 conn->sta_flags |= STA_PS_APSD_EOSP;
1258
1259 ath6kl_data_tx(skb, vif->ndev);
1260 conn->sta_flags &= ~(STA_PS_APSD_TRIGGER);
1261 conn->sta_flags &= ~(STA_PS_APSD_EOSP);
1262 }
1263
1264 if (is_apsdq_empty) {
1265 if (is_apsdq_empty_at_start)
1266 flags = WMI_AP_APSD_NO_DELIVERY_FRAMES;
1267 else
1268 flags = 0;
1269
1270 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
1271 vif->fw_vif_idx,
1272 conn->aid, 0, flags);
1273 }
1274
1275 return;
1276 }
1277
1278 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1279 {
1280 struct ath6kl *ar = target->dev->ar;
1281 struct sk_buff *skb = packet->pkt_cntxt;
1282 struct wmi_rx_meta_v2 *meta;
1283 struct wmi_data_hdr *dhdr;
1284 int min_hdr_len;
1285 u8 meta_type, dot11_hdr = 0;
1286 int status = packet->status;
1287 enum htc_endpoint_id ept = packet->endpoint;
1288 bool is_amsdu, prev_ps, ps_state = false;
1289 bool trig_state = false;
1290 struct ath6kl_sta *conn = NULL;
1291 struct sk_buff *skb1 = NULL;
1292 struct ethhdr *datap = NULL;
1293 struct ath6kl_vif *vif;
1294 struct aggr_info_conn *aggr_conn;
1295 u16 seq_no, offset;
1296 u8 tid, if_idx;
1297
1298 ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1299 "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1300 __func__, ar, ept, skb, packet->buf,
1301 packet->act_len, status);
1302
1303 if (status || !(skb->data + HTC_HDR_LENGTH)) {
1304 dev_kfree_skb(skb);
1305 return;
1306 }
1307
1308 skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1309 skb_pull(skb, HTC_HDR_LENGTH);
1310
1311 ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1312 skb->data, skb->len);
1313
1314 if (ept == ar->ctrl_ep) {
1315 if (test_bit(WMI_ENABLED, &ar->flag)) {
1316 ath6kl_check_wow_status(ar);
1317 ath6kl_wmi_control_rx(ar->wmi, skb);
1318 return;
1319 }
1320 if_idx =
1321 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1322 } else {
1323 if_idx =
1324 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1325 }
1326
1327 vif = ath6kl_get_vif_by_index(ar, if_idx);
1328 if (!vif) {
1329 dev_kfree_skb(skb);
1330 return;
1331 }
1332
1333 /*
1334 * Take lock to protect buffer counts and adaptive power throughput
1335 * state.
1336 */
1337 spin_lock_bh(&vif->if_lock);
1338
1339 vif->net_stats.rx_packets++;
1340 vif->net_stats.rx_bytes += packet->act_len;
1341
1342 spin_unlock_bh(&vif->if_lock);
1343
1344 skb->dev = vif->ndev;
1345
1346 if (!test_bit(WMI_ENABLED, &ar->flag)) {
1347 if (EPPING_ALIGNMENT_PAD > 0)
1348 skb_pull(skb, EPPING_ALIGNMENT_PAD);
1349 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1350 return;
1351 }
1352
1353 ath6kl_check_wow_status(ar);
1354
1355 min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1356 sizeof(struct ath6kl_llc_snap_hdr);
1357
1358 dhdr = (struct wmi_data_hdr *) skb->data;
1359
1360 /*
1361 * In the case of AP mode we may receive NULL data frames
1362 * that do not have LLC hdr. They are 16 bytes in size.
1363 * Allow these frames in the AP mode.
1364 */
1365 if (vif->nw_type != AP_NETWORK &&
1366 ((packet->act_len < min_hdr_len) ||
1367 (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1368 ath6kl_info("frame len is too short or too long\n");
1369 vif->net_stats.rx_errors++;
1370 vif->net_stats.rx_length_errors++;
1371 dev_kfree_skb(skb);
1372 return;
1373 }
1374
1375 /* Get the Power save state of the STA */
1376 if (vif->nw_type == AP_NETWORK) {
1377 meta_type = wmi_data_hdr_get_meta(dhdr);
1378
1379 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1380 WMI_DATA_HDR_PS_MASK);
1381
1382 offset = sizeof(struct wmi_data_hdr);
1383 trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1384
1385 switch (meta_type) {
1386 case 0:
1387 break;
1388 case WMI_META_VERSION_1:
1389 offset += sizeof(struct wmi_rx_meta_v1);
1390 break;
1391 case WMI_META_VERSION_2:
1392 offset += sizeof(struct wmi_rx_meta_v2);
1393 break;
1394 default:
1395 break;
1396 }
1397
1398 datap = (struct ethhdr *) (skb->data + offset);
1399 conn = ath6kl_find_sta(vif, datap->h_source);
1400
1401 if (!conn) {
1402 dev_kfree_skb(skb);
1403 return;
1404 }
1405
1406 /*
1407 * If there is a change in PS state of the STA,
1408 * take appropriate steps:
1409 *
1410 * 1. If Sleep-->Awake, flush the psq for the STA
1411 * Clear the PVB for the STA.
1412 * 2. If Awake-->Sleep, Starting queueing frames
1413 * the STA.
1414 */
1415 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1416
1417 if (ps_state)
1418 conn->sta_flags |= STA_PS_SLEEP;
1419 else
1420 conn->sta_flags &= ~STA_PS_SLEEP;
1421
1422 /* Accept trigger only when the station is in sleep */
1423 if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1424 ath6kl_uapsd_trigger_frame_rx(vif, conn);
1425
1426 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1427 if (!(conn->sta_flags & STA_PS_SLEEP)) {
1428 struct sk_buff *skbuff = NULL;
1429 bool is_apsdq_empty;
1430 struct ath6kl_mgmt_buff *mgmt;
1431 u8 idx;
1432
1433 spin_lock_bh(&conn->psq_lock);
1434 while (conn->mgmt_psq_len > 0) {
1435 mgmt = list_first_entry(
1436 &conn->mgmt_psq,
1437 struct ath6kl_mgmt_buff,
1438 list);
1439 list_del(&mgmt->list);
1440 conn->mgmt_psq_len--;
1441 spin_unlock_bh(&conn->psq_lock);
1442 idx = vif->fw_vif_idx;
1443
1444 ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1445 idx,
1446 mgmt->id,
1447 mgmt->freq,
1448 mgmt->wait,
1449 mgmt->buf,
1450 mgmt->len,
1451 mgmt->no_cck);
1452
1453 kfree(mgmt);
1454 spin_lock_bh(&conn->psq_lock);
1455 }
1456 conn->mgmt_psq_len = 0;
1457 while ((skbuff = skb_dequeue(&conn->psq))) {
1458 spin_unlock_bh(&conn->psq_lock);
1459 ath6kl_data_tx(skbuff, vif->ndev);
1460 spin_lock_bh(&conn->psq_lock);
1461 }
1462
1463 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1464 while ((skbuff = skb_dequeue(&conn->apsdq))) {
1465 spin_unlock_bh(&conn->psq_lock);
1466 ath6kl_data_tx(skbuff, vif->ndev);
1467 spin_lock_bh(&conn->psq_lock);
1468 }
1469 spin_unlock_bh(&conn->psq_lock);
1470
1471 if (!is_apsdq_empty)
1472 ath6kl_wmi_set_apsd_bfrd_traf(
1473 ar->wmi,
1474 vif->fw_vif_idx,
1475 conn->aid, 0, 0);
1476
1477 /* Clear the PVB for this STA */
1478 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1479 conn->aid, 0);
1480 }
1481 }
1482
1483 /* drop NULL data frames here */
1484 if ((packet->act_len < min_hdr_len) ||
1485 (packet->act_len >
1486 WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1487 dev_kfree_skb(skb);
1488 return;
1489 }
1490 }
1491
1492 is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1493 tid = wmi_data_hdr_get_up(dhdr);
1494 seq_no = wmi_data_hdr_get_seqno(dhdr);
1495 meta_type = wmi_data_hdr_get_meta(dhdr);
1496 dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1497 skb_pull(skb, sizeof(struct wmi_data_hdr));
1498
1499 switch (meta_type) {
1500 case WMI_META_VERSION_1:
1501 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1502 break;
1503 case WMI_META_VERSION_2:
1504 meta = (struct wmi_rx_meta_v2 *) skb->data;
1505 if (meta->csum_flags & 0x1) {
1506 skb->ip_summed = CHECKSUM_COMPLETE;
1507 skb->csum = (__force __wsum) meta->csum;
1508 }
1509 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1510 break;
1511 default:
1512 break;
1513 }
1514
1515 if (dot11_hdr)
1516 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1517 else if (!is_amsdu)
1518 status = ath6kl_wmi_dot3_2_dix(skb);
1519
1520 if (status) {
1521 /*
1522 * Drop frames that could not be processed (lack of
1523 * memory, etc.)
1524 */
1525 dev_kfree_skb(skb);
1526 return;
1527 }
1528
1529 if (!(vif->ndev->flags & IFF_UP)) {
1530 dev_kfree_skb(skb);
1531 return;
1532 }
1533
1534 if (vif->nw_type == AP_NETWORK) {
1535 datap = (struct ethhdr *) skb->data;
1536 if (is_multicast_ether_addr(datap->h_dest))
1537 /*
1538 * Bcast/Mcast frames should be sent to the
1539 * OS stack as well as on the air.
1540 */
1541 skb1 = skb_copy(skb, GFP_ATOMIC);
1542 else {
1543 /*
1544 * Search for a connected STA with dstMac
1545 * as the Mac address. If found send the
1546 * frame to it on the air else send the
1547 * frame up the stack.
1548 */
1549 conn = ath6kl_find_sta(vif, datap->h_dest);
1550
1551 if (conn && ar->intra_bss) {
1552 skb1 = skb;
1553 skb = NULL;
1554 } else if (conn && !ar->intra_bss) {
1555 dev_kfree_skb(skb);
1556 skb = NULL;
1557 }
1558 }
1559 if (skb1)
1560 ath6kl_data_tx(skb1, vif->ndev);
1561
1562 if (skb == NULL) {
1563 /* nothing to deliver up the stack */
1564 return;
1565 }
1566 }
1567
1568 datap = (struct ethhdr *) skb->data;
1569
1570 if (is_unicast_ether_addr(datap->h_dest)) {
1571 if (vif->nw_type == AP_NETWORK) {
1572 conn = ath6kl_find_sta(vif, datap->h_source);
1573 if (!conn)
1574 return;
1575 aggr_conn = conn->aggr_conn;
1576 } else
1577 aggr_conn = vif->aggr_cntxt->aggr_conn;
1578
1579 if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1580 is_amsdu, skb)) {
1581 /* aggregation code will handle the skb */
1582 return;
1583 }
1584 }
1585
1586 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1587 }
1588
1589 static void aggr_timeout(unsigned long arg)
1590 {
1591 u8 i, j;
1592 struct aggr_info_conn *aggr_conn = (struct aggr_info_conn *) arg;
1593 struct rxtid *rxtid;
1594 struct rxtid_stats *stats;
1595
1596 for (i = 0; i < NUM_OF_TIDS; i++) {
1597 rxtid = &aggr_conn->rx_tid[i];
1598 stats = &aggr_conn->stat[i];
1599
1600 if (!rxtid->aggr || !rxtid->timer_mon || rxtid->progress)
1601 continue;
1602
1603 stats->num_timeouts++;
1604 ath6kl_dbg(ATH6KL_DBG_AGGR,
1605 "aggr timeout (st %d end %d)\n",
1606 rxtid->seq_next,
1607 ((rxtid->seq_next + rxtid->hold_q_sz-1) &
1608 ATH6KL_MAX_SEQ_NO));
1609 aggr_deque_frms(aggr_conn, i, 0, 0);
1610 }
1611
1612 aggr_conn->timer_scheduled = false;
1613
1614 for (i = 0; i < NUM_OF_TIDS; i++) {
1615 rxtid = &aggr_conn->rx_tid[i];
1616
1617 if (rxtid->aggr && rxtid->hold_q) {
1618 for (j = 0; j < rxtid->hold_q_sz; j++) {
1619 if (rxtid->hold_q[j].skb) {
1620 aggr_conn->timer_scheduled = true;
1621 rxtid->timer_mon = true;
1622 rxtid->progress = false;
1623 break;
1624 }
1625 }
1626
1627 if (j >= rxtid->hold_q_sz)
1628 rxtid->timer_mon = false;
1629 }
1630 }
1631
1632 if (aggr_conn->timer_scheduled)
1633 mod_timer(&aggr_conn->timer,
1634 jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT));
1635 }
1636
1637 static void aggr_delete_tid_state(struct aggr_info_conn *aggr_conn, u8 tid)
1638 {
1639 struct rxtid *rxtid;
1640 struct rxtid_stats *stats;
1641
1642 if (!aggr_conn || tid >= NUM_OF_TIDS)
1643 return;
1644
1645 rxtid = &aggr_conn->rx_tid[tid];
1646 stats = &aggr_conn->stat[tid];
1647
1648 if (rxtid->aggr)
1649 aggr_deque_frms(aggr_conn, tid, 0, 0);
1650
1651 rxtid->aggr = false;
1652 rxtid->progress = false;
1653 rxtid->timer_mon = false;
1654 rxtid->win_sz = 0;
1655 rxtid->seq_next = 0;
1656 rxtid->hold_q_sz = 0;
1657
1658 kfree(rxtid->hold_q);
1659 rxtid->hold_q = NULL;
1660
1661 memset(stats, 0, sizeof(struct rxtid_stats));
1662 }
1663
1664 void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid_mux, u16 seq_no,
1665 u8 win_sz)
1666 {
1667 struct ath6kl_sta *sta;
1668 struct aggr_info_conn *aggr_conn = NULL;
1669 struct rxtid *rxtid;
1670 struct rxtid_stats *stats;
1671 u16 hold_q_size;
1672 u8 tid, aid;
1673
1674 if (vif->nw_type == AP_NETWORK) {
1675 aid = ath6kl_get_aid(tid_mux);
1676 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1677 if (sta)
1678 aggr_conn = sta->aggr_conn;
1679 } else
1680 aggr_conn = vif->aggr_cntxt->aggr_conn;
1681
1682 if (!aggr_conn)
1683 return;
1684
1685 tid = ath6kl_get_tid(tid_mux);
1686 if (tid >= NUM_OF_TIDS)
1687 return;
1688
1689 rxtid = &aggr_conn->rx_tid[tid];
1690 stats = &aggr_conn->stat[tid];
1691
1692 if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1693 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1694 __func__, win_sz, tid);
1695
1696 if (rxtid->aggr)
1697 aggr_delete_tid_state(aggr_conn, tid);
1698
1699 rxtid->seq_next = seq_no;
1700 hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1701 rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1702 if (!rxtid->hold_q)
1703 return;
1704
1705 rxtid->win_sz = win_sz;
1706 rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1707 if (!skb_queue_empty(&rxtid->q))
1708 return;
1709
1710 rxtid->aggr = true;
1711 }
1712
1713 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1714 struct aggr_info_conn *aggr_conn)
1715 {
1716 struct rxtid *rxtid;
1717 u8 i;
1718
1719 aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1720 aggr_conn->dev = vif->ndev;
1721 init_timer(&aggr_conn->timer);
1722 aggr_conn->timer.function = aggr_timeout;
1723 aggr_conn->timer.data = (unsigned long) aggr_conn;
1724 aggr_conn->aggr_info = aggr_info;
1725
1726 aggr_conn->timer_scheduled = false;
1727
1728 for (i = 0; i < NUM_OF_TIDS; i++) {
1729 rxtid = &aggr_conn->rx_tid[i];
1730 rxtid->aggr = false;
1731 rxtid->progress = false;
1732 rxtid->timer_mon = false;
1733 skb_queue_head_init(&rxtid->q);
1734 spin_lock_init(&rxtid->lock);
1735 }
1736
1737 }
1738
1739 struct aggr_info *aggr_init(struct ath6kl_vif *vif)
1740 {
1741 struct aggr_info *p_aggr = NULL;
1742
1743 p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1744 if (!p_aggr) {
1745 ath6kl_err("failed to alloc memory for aggr_node\n");
1746 return NULL;
1747 }
1748
1749 p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL);
1750 if (!p_aggr->aggr_conn) {
1751 ath6kl_err("failed to alloc memory for connection specific aggr info\n");
1752 kfree(p_aggr);
1753 return NULL;
1754 }
1755
1756 aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn);
1757
1758 skb_queue_head_init(&p_aggr->rx_amsdu_freeq);
1759 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS);
1760
1761 return p_aggr;
1762 }
1763
1764 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux)
1765 {
1766 struct ath6kl_sta *sta;
1767 struct rxtid *rxtid;
1768 struct aggr_info_conn *aggr_conn = NULL;
1769 u8 tid, aid;
1770
1771 if (vif->nw_type == AP_NETWORK) {
1772 aid = ath6kl_get_aid(tid_mux);
1773 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1774 if (sta)
1775 aggr_conn = sta->aggr_conn;
1776 } else
1777 aggr_conn = vif->aggr_cntxt->aggr_conn;
1778
1779 if (!aggr_conn)
1780 return;
1781
1782 tid = ath6kl_get_tid(tid_mux);
1783 if (tid >= NUM_OF_TIDS)
1784 return;
1785
1786 rxtid = &aggr_conn->rx_tid[tid];
1787
1788 if (rxtid->aggr)
1789 aggr_delete_tid_state(aggr_conn, tid);
1790 }
1791
1792 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1793 {
1794 u8 tid;
1795
1796 if (!aggr_conn)
1797 return;
1798
1799 if (aggr_conn->timer_scheduled) {
1800 del_timer(&aggr_conn->timer);
1801 aggr_conn->timer_scheduled = false;
1802 }
1803
1804 for (tid = 0; tid < NUM_OF_TIDS; tid++)
1805 aggr_delete_tid_state(aggr_conn, tid);
1806 }
1807
1808 /* clean up our amsdu buffer list */
1809 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1810 {
1811 struct htc_packet *packet, *tmp_pkt;
1812
1813 spin_lock_bh(&ar->lock);
1814 if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1815 spin_unlock_bh(&ar->lock);
1816 return;
1817 }
1818
1819 list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1820 list) {
1821 list_del(&packet->list);
1822 spin_unlock_bh(&ar->lock);
1823 dev_kfree_skb(packet->pkt_cntxt);
1824 spin_lock_bh(&ar->lock);
1825 }
1826
1827 spin_unlock_bh(&ar->lock);
1828 }
1829
1830 void aggr_module_destroy(struct aggr_info *aggr_info)
1831 {
1832 if (!aggr_info)
1833 return;
1834
1835 aggr_reset_state(aggr_info->aggr_conn);
1836 skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1837 kfree(aggr_info->aggr_conn);
1838 kfree(aggr_info);
1839 }
Linux kernel - Deliverables
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